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      <img src="../logo.svg" class="logo" alt=""><h1>DRAFT utility to use formulas provided as text, to calculate indicators</h1>
      <small class="dont-index">Source: <a href="https://github.com/USEPA/EJAM/blob/HEAD/R/utils_calc_ejam.R" class="external-link"><code>R/utils_calc_ejam.R</code></a></small>
      <div class="d-none name"><code>calc_byformula.Rd</code></div>
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    <p>DRAFT utility to use formulas provided as text, to calculate indicators</p>
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    <h2 id="ref-usage">Usage<a class="anchor" aria-label="anchor" href="#ref-usage"></a></h2>
    <div class="sourceCode"><pre class="sourceCode r"><code><span><span class="fu">calc_byformula</span><span class="op">(</span><span class="va">mydf</span>, formulas <span class="op">=</span> <span class="cn">NULL</span>, keep <span class="op">=</span> <span class="fu"><a href="formula_varname.html">formula_varname</a></span><span class="op">(</span><span class="va">formulas</span><span class="op">)</span><span class="op">)</span></span></code></pre></div>
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    <h2 id="arguments">Arguments<a class="anchor" aria-label="anchor" href="#arguments"></a></h2>


<dl><dt id="arg-mydf">mydf<a class="anchor" aria-label="anchor" href="#arg-mydf"></a></dt>
<dd><p>data.frame of indicators or variables to use</p></dd>


<dt id="arg-formulas">formulas<a class="anchor" aria-label="anchor" href="#arg-formulas"></a></dt>
<dd><p>text strings of formulas</p></dd>


<dt id="arg-keep">keep<a class="anchor" aria-label="anchor" href="#arg-keep"></a></dt>
<dd><p>useful if some of the formulas are just interim steps
creating evanescent variables created only for use in later formulas
and not needed after that</p></dd>

</dl></div>
    <div class="section level2">
    <h2 id="value">Value<a class="anchor" aria-label="anchor" href="#value"></a></h2>
    <p>data.frame of results, but
if mydf was a data.table, returns a data.table</p>
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